-- @testpoint: opengauss关键字nullif(非保留)，作为函数名,部分测试点合理报错

--关键字不带引号
drop function if exists nullif;
create function nullif(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带双引号
drop function if exists "nullif";
create function "nullif"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带单引号-合理报错
drop function if exists 'nullif';
create function 'nullif'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `nullif`;
create function `nullif`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function if exists "nullif"(integer);